Chair frame



FIG. 1 is a front perspective view of the chair frame showing my design;

FIG. 2 is a front view of the chair frame showing my design;

FIG. 3 is a side view of the chair frame showing my design, the otherside being identical therewith;

FIG. 4 is a back view of the chair frame showing my design;

FIG. 5 is a top view of the chair frame showing my design; and

FIG. 6 is a bottom view of the chair frame showing my design.

The ornamental design for a chair frame, as shown and described.